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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-11991" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-0b8ae9eb-9ac0-4951-967a-a1a89fad490b" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11991" style="color: #3b73af; text-decoration: none">HHH-11991</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-11991" style="color: #3b73af; text-decoration: none">Unnecessary sql updates are triggerd for all elements in map</a> </span> </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-0b8ae9eb-9ac0-4951-967a-a1a89fad490b" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Affects Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.2.7 </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 15/Sep/2017 01:31 AM </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Environment:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Hibernate 5.2.7.Final; Oracle 10g Database </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-major-4afbfb3a-b00e-49d8-a95d-2dcad7e7dd97" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Reporter:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="marc.hanggi" id="email_marc.hanggi" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=marc.hanggi" style="color:#6c797f;; color: #3b73af; text-decoration: none">Marc Hanggi</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">Dear Hibernate Developers</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"><a href="https://forum.hibernate.org/viewtopic.php?f=1&t=1044827&p=2493417#p2493417" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">I have already talked to Vlad about this problem</a></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Hibernate triggers unnecessary update statements for all previous elements of a map if a new element is being added to this map. The problem only occures for maps with bidirectional bindings and HBM XML mappings. I was unable to reproduce the issue with annotation based mappings or unidirectional bindings.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I built a simple demo projects containing two classes for illustration purposes. A person object referencing one or more task objects.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Person.hbm.xml</p>
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<pre class="code-xml" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-tag" style="color: #000091"><hibernate-mapping></span>
<span class="code-tag" style="color: #000091"><class name=<span class="code-quote" style="color: #009100">"persistency.test.Person"</span> table=<span class="code-quote" style="color: #009100">"person"</span> lazy=<span class="code-quote" style="color: #009100">"true"</span>></span>
<span class="code-tag" style="color: #000091"><id name=<span class="code-quote" style="color: #009100">"dbKey"</span> type=<span class="code-quote" style="color: #009100">"long"</span> access=<span class="code-quote" style="color: #009100">"field"</span> column=<span class="code-quote" style="color: #009100">"dbkey"</span>></span>
<span class="code-tag" style="color: #000091"><generator class=<span class="code-quote" style="color: #009100">"native"</span> /></span>
<span class="code-tag" style="color: #000091"></id></span>
<span class="code-tag" style="color: #000091"><property name=<span class="code-quote" style="color: #009100">"name"</span> type=<span class="code-quote" style="color: #009100">"java.lang.String"</span> length=<span class="code-quote" style="color: #009100">"20"</span> access=<span class="code-quote" style="color: #009100">"field"</span> /></span>
<span class="code-tag" style="color: #000091"><map name=<span class="code-quote" style="color: #009100">"tasks"</span> cascade=<span class="code-quote" style="color: #009100">"all-delete-orphan"</span> inverse=<span class="code-quote" style="color: #009100">"true"</span> access=<span class="code-quote" style="color: #009100">"field"</span>></span>
<span class="code-tag" style="color: #000091"><key column=<span class="code-quote" style="color: #009100">"person_dbkey"</span> /></span>
<span class="code-tag" style="color: #000091"><map-key type=<span class="code-quote" style="color: #009100">"string"</span> column=<span class="code-quote" style="color: #009100">"name"</span> /></span>
<span class="code-tag" style="color: #000091"><one-to-many class=<span class="code-quote" style="color: #009100">"persistency.test.Task"</span> /></span>
<span class="code-tag" style="color: #000091"></map></span>
<span class="code-tag" style="color: #000091"></class></span>
<span class="code-tag" style="color: #000091"></hibernate-mapping></span>
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Person.java</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Person {
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> name;
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">long</span> dbKey;
<span class="code-keyword" style="color: #000091">private</span> Map<<span class="code-object" style="color: #910091">String</span>, Task> tasks = <span class="code-keyword" style="color: #000091">new</span> HashMap<>();
<span class="code-keyword" style="color: #000091">public</span> void addTask(Task task) {
task.setOwner(<span class="code-keyword" style="color: #000091">this</span>);
<span class="code-keyword" style="color: #000091">this</span>.tasks.put(task.getName(), task);
}
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Task.hbm.xml</p>
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<pre class="code-xml" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-tag" style="color: #000091"><hibernate-mapping></span>
<span class="code-tag" style="color: #000091"><class name=<span class="code-quote" style="color: #009100">"persistency.test.Task"</span> table=<span class="code-quote" style="color: #009100">"task"</span> lazy=<span class="code-quote" style="color: #009100">"true"</span>></span>
<span class="code-tag" style="color: #000091"><id name=<span class="code-quote" style="color: #009100">"dbKey"</span> type=<span class="code-quote" style="color: #009100">"long"</span> access=<span class="code-quote" style="color: #009100">"field"</span> column=<span class="code-quote" style="color: #009100">"dbkey"</span>></span>
<span class="code-tag" style="color: #000091"><generator class=<span class="code-quote" style="color: #009100">"native"</span> /></span>
<span class="code-tag" style="color: #000091"></id></span>
<span class="code-tag" style="color: #000091"><property name=<span class="code-quote" style="color: #009100">"name"</span> type=<span class="code-quote" style="color: #009100">"java.lang.String"</span> length=<span class="code-quote" style="color: #009100">"20"</span> access=<span class="code-quote" style="color: #009100">"field"</span> /></span>
<span class="code-tag" style="color: #000091"><property name=<span class="code-quote" style="color: #009100">"description"</span> type=<span class="code-quote" style="color: #009100">"java.lang.String"</span> length=<span class="code-quote" style="color: #009100">"100"</span> access=<span class="code-quote" style="color: #009100">"field"</span> /></span>
<span class="code-tag" style="color: #000091"><many-to-one name=<span class="code-quote" style="color: #009100">"owner"</span> column=<span class="code-quote" style="color: #009100">"person_dbkey"</span> class=<span class="code-quote" style="color: #009100">"persistency.test.Person"</span> access=<span class="code-quote" style="color: #009100">"field"</span> /></span>
<span class="code-tag" style="color: #000091"></class></span>
<span class="code-tag" style="color: #000091"></hibernate-mapping></span></pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Task.java</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>Task {
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> name;
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">long</span> dbKey;
<span class="code-keyword" style="color: #000091">private</span> Person owner;
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">String</span> description;
<span class="code-keyword" style="color: #000091">public</span> Task(<span class="code-object" style="color: #910091">String</span> name, <span class="code-object" style="color: #910091">String</span> description) {
<span class="code-keyword" style="color: #000091">this</span>.name = name;
<span class="code-keyword" style="color: #000091">this</span>.description = description;
}
<span class="code-keyword" style="color: #000091">public</span> Task() { }
<span class="code-keyword" style="color: #000091">public</span> <span class="code-object" style="color: #910091">String</span> getName() {
<span class="code-keyword" style="color: #000091">return</span> name;
}
<span class="code-keyword" style="color: #000091">public</span> void setOwner(Person owner) {
<span class="code-keyword" style="color: #000091">this</span>.owner = owner;
}
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The table Task already contains three tasks:</p>
<div class="preformatted panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-all; white-space: pre-wrap">DBKEY | NAME | PERSON_DBKEY | DESCRIPTION
221000 | Eating | 139000 | Food
218000 | Cooking | 139000 | Food
225000 | Reading | 139000 | Food
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">If a new task is being added to the map containg already three tasks:</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
session.beginTransaction();
Person person = session.load(Person.class, 139000l);
person.addTask(<span class="code-keyword" style="color: #000091">new</span> Task(<span class="code-quote" style="color: #009100">"Cleaning"</span>, <span class="code-quote" style="color: #009100">"Floor, Roof"</span>));
session.getTransaction().commit();
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Hibernate then executes the following SQL statements:</p>
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<pre class="code-sql" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">select</span> person0_.dbkey <span class="code-keyword" style="color: #000091">as</span> dbkey1_0_0_, person0_.<span class="code-keyword" style="color: #000091">name</span> <span class="code-keyword" style="color: #000091">as</span> name2_0_0_ <span class="code-keyword" style="color: #000091">from</span> XHM_2.person person0_ <span class="code-keyword" style="color: #000091">where</span> person0_.dbkey=?
<span class="code-keyword" style="color: #000091">select</span> tasks0_.person_dbkey <span class="code-keyword" style="color: #000091">as</span> person_dbkey4_1_0_, tasks0_.dbkey <span class="code-keyword" style="color: #000091">as</span> dbkey1_1_0_, tasks0_.<span class="code-keyword" style="color: #000091">name</span> <span class="code-keyword" style="color: #000091">as</span> name2_0_, tasks0_.dbkey <span class="code-keyword" style="color: #000091">as</span> dbkey1_1_1_, tasks0_.<span class="code-keyword" style="color: #000091">name</span> <span class="code-keyword" style="color: #000091">as</span> name2_1_1_, tasks0_.description <span class="code-keyword" style="color: #000091">as</span> description3_1_1_, tasks0_.person_dbkey <span class="code-keyword" style="color: #000091">as</span> person_dbkey4_1_1_ <span class="code-keyword" style="color: #000091">from</span> XHM_2.task tasks0_ <span class="code-keyword" style="color: #000091">where</span> tasks0_.person_dbkey=?
<span class="code-keyword" style="color: #000091">select</span> XHM_2.hibernate_sequence.nextval <span class="code-keyword" style="color: #000091">from</span> <span class="code-keyword" style="color: #000091">dual</span>
<span class="code-keyword" style="color: #000091">insert</span> <span class="code-keyword" style="color: #000091">into</span> XHM_2.task (<span class="code-keyword" style="color: #000091">name</span>, description, person_dbkey, dbkey) <span class="code-keyword" style="color: #000091">values</span> (<span class="code-quote" style="color: #009100">'Cleaning'</span>, <span class="code-quote" style="color: #009100">'<span class="code-keyword" style="color: #000091; color: #009100">Floor</span>, Roof'</span>, <span class="code-quote" style="color: #009100">'139000'</span>, <span class="code-quote" style="color: #009100">'224000'</span>)
<span class="code-keyword" style="color: #000091">update</span> XHM_2.task <span class="code-keyword" style="color: #000091">set</span> <span class="code-keyword" style="color: #000091">name</span>=<span class="code-quote" style="color: #009100">'Eating'</span> <span class="code-keyword" style="color: #000091">where</span> dbkey=<span class="code-quote" style="color: #009100">'221000'</span>
<span class="code-keyword" style="color: #000091">update</span> XHM_2.task <span class="code-keyword" style="color: #000091">set</span> <span class="code-keyword" style="color: #000091">name</span>=<span class="code-quote" style="color: #009100">'Cooking'</span> <span class="code-keyword" style="color: #000091">where</span> dbkey=<span class="code-quote" style="color: #009100">'218000'</span>
<span class="code-keyword" style="color: #000091">update</span> XHM_2.task <span class="code-keyword" style="color: #000091">set</span> <span class="code-keyword" style="color: #000091">name</span>=<span class="code-quote" style="color: #009100">'Reading'</span> <span class="code-keyword" style="color: #000091">where</span> dbkey=<span class="code-quote" style="color: #009100">'225000'</span>
<span class="code-keyword" style="color: #000091">update</span> XHM_2.task <span class="code-keyword" style="color: #000091">set</span> <span class="code-keyword" style="color: #000091">name</span>=<span class="code-quote" style="color: #009100">'Cleaning'</span> <span class="code-keyword" style="color: #000091">where</span> dbkey=<span class="code-quote" style="color: #009100">'224000'</span>
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Hibernate triggers for update statements as shown above. I think there is no reason to update the previous three elements and the newly added element either.</p> </td>
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